linux-kernel - Re: [PATCH v5 2/4] x86: add support for earlyprintk via USB3 debug port

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Message-ID: <58817A87.9070305@linux.intel.com>
Date:   Fri, 20 Jan 2017 10:48:39 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>, tglx@...utronix.de,
        peterz@...radead.org, linux-usb@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/4] x86: add support for earlyprintk via USB3 debug
 port

Hi Ingo,

On 01/19/2017 05:38 PM, Ingo Molnar wrote:
> * Lu Baolu <baolu.lu@...ux.intel.com> wrote:
>
>> index 8a12199..c4031b9 100644
>> --- a/arch/x86/kernel/early_printk.c
>> +++ b/arch/x86/kernel/early_printk.c
>> @@ -17,6 +17,7 @@
>>  #include <asm/intel-mid.h>
>>  #include <asm/pgtable.h>
>>  #include <linux/usb/ehci_def.h>
>> +#include <linux/usb/xhci-dbgp.h>
>>  #include <linux/efi.h>
>>  #include <asm/efi.h>
>>  #include <asm/pci_x86.h>
>> @@ -381,6 +382,10 @@ static int __init setup_early_printk(char *buf)
>>  		if (!strncmp(buf, "efi", 3))
>>  			early_console_register(&early_efi_console, keep);
>>  #endif
>> +#ifdef CONFIG_EARLY_PRINTK_XDBC
>> +		if (!strncmp(buf, "xdbc", 4))
>> +			early_xdbc_parse_parameter(buf + 4);
>> +#endif
>>  
>>  		buf++;
>>  	}
>> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
>> index 9c337b0..09d4a56 100644
>> --- a/arch/x86/kernel/setup.c
>> +++ b/arch/x86/kernel/setup.c
>> @@ -70,6 +70,8 @@
>>  #include <linux/tboot.h>
>>  #include <linux/jiffies.h>
>>  
>> +#include <linux/usb/xhci-dbgp.h>
>> +
>>  #include <video/edid.h>
>>  
>>  #include <asm/mtrr.h>
>> @@ -1096,6 +1098,11 @@ void __init setup_arch(char **cmdline_p)
>>  	memblock_set_current_limit(ISA_END_ADDRESS);
>>  	memblock_x86_fill();
>>  
>> +#ifdef CONFIG_EARLY_PRINTK_XDBC
>> +	if (!early_xdbc_setup_hardware())
>> +		early_xdbc_register_console();
>> +#endif
>> +
>>  	reserve_bios_regions();
>>  
>>  	if (efi_enabled(EFI_MEMMAP)) {
>> -- 
>> 2.1.4
> Please create proper wrappers in xhci-dbgp.h to not litter generic code with these
> #ifdefs.

Sure.

Best regards,
Lu Baolu